5d mark 2

SEM images were obtained using an SEM (Hitachi S-3000N). Color photos and videos were taken on a digital camera (Canon 5D Mark II). Raman spectroscopy was conducted using a Raman microscope (RAMAN, inVia, Renishaw) with a 532-nm laser to analyze the surface physicochemical structure of the products. The mechanical strength of the graphene aerogel foam was tested using an Instron 5943 single-column testing machine (ITW) with a load cell capacity of 1 kN. The loading process was displacement-controlled, and the loading rate was set to be 3 mm min⁻¹. DSC thermograms were measured using DSC 8000 (PerkinElmer), with second heating curves and cooling curves at heating and cooling rates of 10°C min⁻¹. The resistance of the graphene foam was measured by a semiconductor characterization system (4200-SCS/F, Keithley). Water contact angles were obtained by a JC2000D2 contact angle measuring system at ambient temperature. Sliding angles were measured on a customized tilting stage with a droplet volume of 6 μl. Static contact angles were recorded with a droplet volume of 2 μl. The static contact angles were measured at a neutral tilting angle (0°). The tested liquids were hexane (18.43 mN m⁻¹), heptane (20.14 mN m⁻¹), octane (21.6 mN m⁻¹), decane (23.7 mN m⁻¹), dodecane (25.4 mN m⁻¹), hexadecane (27.3 mN m⁻¹), ethylene glycol (48.1 mN m⁻¹), glycerol (60.3 mN m⁻¹), and water (72.4 mN m⁻¹).